Seiko Cal. 6681 - 738

The 6681-738 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6681 caliber with 31j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-943a6ded3da5]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

13.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1969

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